Leaky oil pump

[Robbie693]

Hello,

Another job I have to do at the moment is to fix a slight leak from the oil pump end plate. The pump is a new one, (well, fitted two years ago), and I had the end cover off to check the 'O' ring and it looks fine and I've tightened the cover as much as I dare so the only thing I can guess as to what is causing the leak is either the groove is too deep or the O ring is too thin but, as far as I can recall, it wasn't leaking after I fitted it so I've no idea why it is now...

Anyway, I was wondering if a smear of Wellseal on the O ring would be a good idea?

Cheers

Robbie

[rgh0]

Hi Robbie
Get a new O-ring
I know a number of new pumps a few years ago had an undersize O ring fitted that caused leaks.

cheers
Rohan

[Robbie693]

Ah I see - thanks Rohan.

It seems Paul Matty don't sell the O ring, anyone know where I can get one or tell me the exact dimensions so I can find one from an O ring shop?

Cheers

Robbie

[RichardHawkins]

Robbie,

Look for a hydraulic company near you. Most hydraulic companies keep a good stock of O rings, and can probably supply you with the size you need.

Richard Hawkins

[Robbie693]

Thanks Richard, I'll have a look

Cheers

Robbie

[oldchieft]

You should be able to buy O ring stock and make your own with supper glue.

Jon the Chief

[Robbie693]

Hmm, never knew that. Thanks Jon

Robbie

[oldchieft]

http://equipment.loctite.com/documentat ... %20Kit.pdf

Some kits have metric and imperial size in the same kit.

Or just try to buy the size you want individually and a tube of glue but you will be missing the gauge and the jig.

Jon the Chief

[Robbie693]

Nice, thanks again Jon

Robbie

[mbell]

For future reference if anyone else find this thread. The o ring is 2" outer diameter, 1 3/4" inner diameter.

Mine measured as 17/128" thick but that was used, so suspect it would be 9/64" or 5/32" new.

Common thickness for this size is 1/8" so if you change the o ring out with common sized o ring when checking the pump over as I did you can end up with a leak.

[alan.barker]

if the O/d is 2" and I/d 1 3/4 the cross section must be 1/8" or 3.2 mm
Alan

[mbell]

if the O/d is 2" and I/d 1 3/4 the cross section must be 1/8" or 3.2 mm
Alan

I agree that's what the maths says... but the maths isn't very good at fixing oil leaks

No doubts my measuring of a flexible o-ring with a standard metal ruler is subject to a margin of error. Key point is if you put a 1/8" cross section o ring your likely to get an oil leak. So you need to to buy one of larger cross section and approx 2" outer, 1 3/4" inner. These number should be close if enough to locate a suitable o ring with out having to strip the pump down.

[alan.barker]

when i had this problem i took the oil pump with me to a motor factors and got them to try different sizes direct.
Easier to measure groove in body
Alan